$ds_t: 0.2em
$ds_s: 0.41em    
$ds_n: 0.615em
$ds: 0.82em
$ds_x1: 1.23em
$ds_x2: 1.64em
$ds_x3: 2.46em
    
$dss: ("-0": 0px, "": $ds, "-t": $ds_t, "-s": $ds_s, "-n": $ds_n, "-x1": $ds_x1, "-x2": $ds_x2, "-x3": $ds_x3)
